Abstract Hole transport layer (HTL) is important in inverted perovskite solar cells (PSCs) to facilitate the hole extraction and suppress the charge recombination for high device performance. Based on the widely used HTL material of poly(ethylenedioxythiophene) (PEDOT):poly(styrenesulfonate) (PSS), we proposed a new HTL modification method using the widely available copper(I) thiocyanate (CuSCN); the doping of CuSCN NH3 [aq] in PEDOT:PSS followed by low-temperature annealing results in reduced energy barrier, improved charge extraction efficiency and increased the mean size of perovskite crystal of the PEDOT:PSS-CuSCN HTL-based inverted PSCs. Significantly improved device performance was observed with open current voltage over 1.0 V and power conversion efficiency (PCE) up to 15.3%, which is 16% higher in PCE than that of the PEDOT:PSS-based PSCs. More impressively, with a lower acidity than PEDOT:PSS, the PEDOT:PSS-CuSCN HTL enables excellent long-term stability of the inverted PSCs, exhibiting almost doubly improved device stability at the same storage condition. Thus, the successful application of CuSCN doping in PEDOT:PSS HTLs should provide a novel approach for the development of high-performance HTLs for highly efficient and stable PSCs.

中文翻译：

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通过掺杂CuSCN的PEDOT:PSS提高倒置钙钛矿太阳能电池的效率和稳定性

摘要 空穴传输层 (HTL) 在倒置钙钛矿太阳能电池 (PSC) 中很重要，可促进空穴提取并抑制电荷复合以提高器件性能。基于广泛使用的聚（乙撑二氧噻吩）（PEDOT）：聚（苯乙烯磺酸盐）（PSS）的HTL材料，我们提出了一种使用广泛使用的硫氰酸铜（I）（CuSCN）的HTL改性方法；在 PEDOT:PSS 中掺杂 CuSCN NH3 [aq]，然后进行低温退火可降低能量势垒，提高电荷提取效率，并增加基于 PEDOT:PSS-CuSCN HTL 的倒置 PSC 钙钛矿晶体的平均尺寸。在开路电流电压超过 1.0 V 和功率转换效率 (PCE) 高达 15.3% 的情况下观察到显着改善的器件性能，PCE 比基于 PEDOT:PSS 的 PSC 高 16%。更令人印象深刻的是，PEDOT:PSS-CuSCN HTL 具有比 PEDOT:PSS 更低的酸度，使倒置的 PSC 具有出色的长期稳定性，在相同的储存条件下，器件稳定性几乎提高了一倍。因此，CuSCN 掺杂在 PEDOT:PSS HTL 中的成功应用应该为开发用于高效和稳定 PSC 的高性能 HTL 提供一种新方法。